Priyamvada NatarajanProfessor in Departments of Astronomy and Physics at Yale University, focusing on exotica in the universe-dark matter, dark energy, and black holes; Author, Mapping the Heavens

Are there limits to what we can know about the universe?

John NaughtonSenior Research Fellow, Centre for Research in the Arts, Social Sciences and Humanities, University of Cambridge; Director, Wolfson College Press Fellowship Programme; Columnist, the Observer; Author, From Gutenberg to Zuckerberg

Why do humans who possess or acquire unaccountable power over others invariably abuse it?

Randolph NesseProfessor of Life Sciences, Director, Center for Evolution and Medicine, Arizona State University; Co-author (with George C. Williams), Why We Get Sick

In what situations does the capacity for low mood give a selective advantage?